Lost Bird Parrot, Parakeet from London Greater London SE27

This lost Parrot, Parakeet Bird was last seen around London Greater London SE27

Alex managed to open his cage, even the special clip on it.He escaped trough opened doors on Sunday 8th of July 2018 about 6 pm.
We saw him on the trees at Gipsy Road, but there is a lot of other Indian Ringneck parrots in The Norwood Park, he decided to fly there.
We have been told he should be back in three days as it was close to our house and he knows the way to and from the park very goog. But 3 days passed and he is still away...
He may be scared as cars and too much noise isn't something he likes.